Why Does an Aluminum Ring Levitate Above a Magnetic Coil?

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SUMMARY

The discussion centers on the phenomenon of an aluminum ring levitating above a magnetic coil powered by alternating current (AC). The key principle at play is Faraday's Law of Electromagnetic Induction, which states that a changing magnetic field induces an electromotive force (emf) in the ring. This induced emf generates a current that interacts with the magnetic field, resulting in a Lorentz force that propels the ring upward. The rapid changes in the magnetic field due to the AC power supply are sufficient to create a strong enough emf to lift the non-magnetic aluminum ring.

PREREQUISITES
  • Understanding of Faraday's Law of Electromagnetic Induction
  • Knowledge of AC power and its effects on magnetic fields
  • Familiarity with the concept of induced electromotive force (emf)
  • Basic principles of the Lorentz force and its application in electromagnetic systems
NEXT STEPS
  • Study the principles of Faraday's Law in detail
  • Explore the behavior of AC circuits and their magnetic fields
  • Investigate the Lorentz force and its implications in electromagnetic applications
  • Examine practical experiments demonstrating electromagnetic induction and levitation
USEFUL FOR

Students of physics, electrical engineers, and hobbyists interested in electromagnetic phenomena and applications in levitation technology.

cheez
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A magnetic coil connected to AC power and an aluminum ring. The ring was placed on top of the coil and, although aluminum is non magnetic, the ring was thrown to the ceiling. Explain 1, why was there any force on the ring? 2. Why the ring went up? Use diagram and Faraday's Law

I don't know how to answer these questions. :(
I know the alternating current makes the magnetic field changes. And the changing magnetic field generates emf.But I don't know why the emf is large enough to push the aluminum ring upward, and how come it goes up?

thx a lot.
 
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A few more details might help but I would examine the Lorentz force acting on the electrons that were set in motion by the induced EMF.
 

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